Brake shoe



Sept. 19, 1933. w. H. WINTERS Filed Nov. 2, 1932 2. Sheets-Sheet 1INVENTOR. M 1/ M By fl MW ATTORNEY Patented Sept. 19, 1933 UNITED ISTATES BRAKE SHOE WilburH. Winters, Larchmont, N. Y., assignor to .TheAmerican Brake Shoe and Foundry Company, Wilmington, Del., a corporationof Delaware Application November 2, 1932. Serial No. 640,837 I 4 Claims.

This invention relates to brake shoes of that type which includes areenforce back embedded in the body of the shoe at the back thereof tohold the parts of the body together in case of fracture.

The object of the invention isto provide a strong and substantial rigidback which can be made in a rolling operation and anchored in the bodyof the shoe by embedment therein during the casting operation and whichwill resist the vibration stresses, strains and fatigue to which it issubjected after the body is fractured and hold the parts together untilthe shoe is worn out.

In the accompanying drawings I have shown selected embodiments of theinvention and referring thereto,

Fig. 1 is a plan View of the inner side of a reenforce back with thebody indicated in broken lines.

Fig. 2 is a longitudinal sectional View of the shoe.

Figs. 3 and 4 are transverse sectional views on the lines 3-3 and 44respectively of Fig. 2.

Figs. 5 to 11 are transverse sectional views showing other forms of theback.

Referring to the drawings, the body 12 may be solid cast iron, as shown,or it may have inserts embedded therein in any form of composition shoeand the reenforce is embedded in the body at the back of the shoe whenthe body is cast thereon.

I have shown the shoe provided with the usual attaching lug whichcomprises the lug strap 13 having inturned ends 14 engaged with the sidemargins of the back and the body metal extending up to form projections15 enclosing the sides of the strap. The reenforce back consists of astrip of ductile metal preferably made in a rolling operation and it isslightly shorter and narrower than the body and is bent arcuately tocorrespond with the curvature of the body.

Referring to Figs. 1 to 4, the reenforce back 16 has a centrallongitudinal raised panel 17 and depressed side margins 18 which extendthroughout the length of the back, the raised panel being preferablyshorter than the side margins of the back to facilitate the flow of bodymetal for forming the lugs 19 at the ends of the shoe in the castingoperation and to provide substantial anchorage for these lugs to thebody. Lips 20 are provided on the outer side of the back at the edges ofthe panel to strengthen the back. The outer side of the panel 17 isexposed at the back of the shoe and the depressed side margins 18 arewholly embedded in the body of the shoe to anchor the body on the back.I prefer to incline outwardly the parts 21 which connect the depressedside margins with the intermediate panel of the back and to arrange theback in the body so that the top of the reenforcing ribs will lie flushwith the parts of the body outside thereof.

The back may be provided with a longitudinal chordal rib 22 disposedcentrally of the raised panel on the outer side thereof in addition tothe ribs 20 at the side edges of the raised panel, Fig. 5; or the sideribs 20 may be omitted and the back provided with a longitudinal chordalrib 23, Fig. 6, centrally disposed on the outer side of the raisedpanel, in which case this rib would preferably be somewhat larger incross-section than the rib 22 used with the two side ribs 20, Fig. 5.The back may be embedded in the body with the top of the centrallydisposed rib 23 flush with the bodyat the back of the shoe, as shown inFig. 6.

The ribs at the side edges of the raised panel may be formed by makingthe back thicker in those parts 24. which connect the side margins withthe raised panel, Fig. '7. The raised panel may be provided with acentral longitudinal fiat rib 25 on its outer side and a similar rib 26on its inner side together With the side ribs 27, Fig. 8; or the sideribs 27 may be omitted and a fiat rib 28 somewhat wider than the rib 25provided on the outer side or" the panel, Fig. 9. In this form of backthe body metal may extend over the sides of the panel to the side edgesof the rib 28 and lie flush with the outer face of the rib. A wide fiatrib 29'rnay be provided on the outer 35 side of the back and a similarrib 38 on the inner side of the back as shown in Fig. 10, or a fiat 'rib31, Fig. 11, may be provided of sufificient width to extend from oneprojection 15 to the other. q

When the body of a brake shoe fractures in actual service, as itfrequently does, the parts are held tcgether by the back so that theshoe may continue in use and give efiicient service; but this conditionsu m'ects the back to excessive stresses strains due to the constantvibration to which the shoe is subjected in service and these vibrationsresult in the fatigue of metal and the back sometimes breaks before thebody of the. shoe is worn out. My invention provides a back of novelconstruction which is rigid and strong and substantial and which willoutlast the body and continue to hold the parts of a fractured bodytogether until the shoe has reached its limit of wear.

I have shown the invention in a common cast iron car shoe and in severalembodiments but I reserve the right to embody the invention in any brakeshoe to which it is or may be adapted and to make any changes in theform, construction 3- A brake shoe comprising a body, and a reenforceback embedded in the body, said back having a central longitudinalraised panel and an integral strengthening rib on said panel between itsside edges.

4. A brake shoe comprising a body, and a reenforce back embedded in thebody, said back having a central longitudinal raised panel and integralstrengthening ribs on the inner and outer sides of the panel between itsside edges.

WILBUR H. WINTERS.

